<template>
  <div class="app-container">
    <!-- 顶部header 区域 -->
    <mt-header fixed title="大爷的vue项目">
     <!--  <router-link to="/" slot="left">
        <mt-button icon="back">返回</mt-button>
      </router-link> -->
       <span slot="left" @click="goBack" v-show="flag">
        <mt-button icon="back">返回</mt-button>
      </span>
    </mt-header>

    <!-- 中间的 路由 router-view 区域 -->
    <transition>
      <router-view></router-view>
    </transition>

    <!-- 底部Tabbar 区域 -->

    <nav class="mui-bar mui-bar-tab">
      <router-link class="mui-tab-item-llb" to="/home">
        <span class="mui-icon mui-icon-home"></span>
        <span class="mui-tab-label">首页</span>
      </router-link>
      <router-link class="mui-tab-item-llb" to="/member">
        <span class="mui-icon mui-icon-contact"></span>
        <span class="mui-tab-label">会员</span>
      </router-link>
      <router-link class="mui-tab-item-llb" to="/shopcar">
        <span class="mui-icon mui-icon-extra mui-icon-extra-cart">
          <span class="mui-badge" id="badge">{{
            $store.getters.getAllCount
          }}</span></span
        >
        <span class="mui-tab-label">购物车</span>
      </router-link>
      <router-link class="mui-tab-item-llb" to="/search">
        <span class="mui-icon mui-icon-search"></span>
        <span class="mui-tab-label">搜索</span>
      </router-link>
    </nav>
  </div>
</template>

<script>
export default {
    date(){
        return{
            flag:false
        }
    },
    created () {
      this.flag=this.$route.path==="/home" ? false:true
      // 如果path=/home  返回false   否则 返回true  
    },
    methods: {
        goBack(){
            // 点击后退
            this.$router.go(-1)
        }
    },
    watch: {
        '$route.path':function(newVal){
            if(newVal==='/home'){
                this.flag=false
            }else{
                this.flag=true
            }
    }
    }
};
</script>

<style lang="scss" scoped>
.mint-header {
  z-index: 99; //属性设置元素的堆叠顺序
}
.app-container {
  padding: 0px;
  padding-bottom: 50px;
  overflow-x: hidden; //裁剪 div 元素中内容的左/右边缘 - 如果溢出元素的内容区域的话：
}

.v-enter {
  opacity: 0;
  transform: translateX(100%);
}
.v-leave-to {
  opacity: 0;
  transform: translateX(-100%);
  position: absolute;
}
.v-enter-active,
.v-leave-active {
  transition: all 0.5s ease;
}

/* 改类名，解决tabbar 点击无法切换问题 */
.mui-bar-tab .mui-tab-item-llb.mui-active {
  color: #007aff;
}
.mui-bar-tab .mui-tab-item-llb {
  display: table-cell;
  overflow: hidden;
  width: 1%;
  height: 50px;
  text-align: center;
  vertical-align: middle;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: #929292;
}
.mui-bar-tab .mui-tab-item-llb .mui-icon {
  top: 3px;
  width: 24px;
  height: 24px;
  padding-top: 0;
  padding-bottom: 0;
}
.mui-bar-tab .mui-tab-item-llb .mui-icon ~ .mui-tab-label {
  font-size: 11px;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
}
</style>